Assuming that \(\tau _0 \simeq 1\)  ps (see, for example, [1]}, [2]}), for \(2l = (0.5 - 0.75)~\mu \) m and \({\overline{\Phi }} = 400\)  mV [this corresponds to the plots in Figs. 6(b) and 7(b)] and using Eqs. (B2) and (B3), we find \((t^i_0-t^i)/t^i \simeq (3.1 - 4.7)\,\%\) .
